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Finding the Fourth Proportional to 86,008.40, 128,939.04 and 32,670.56

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Solution

The fourth proportional to 86,008.40, 128,939.04 and 32,670.56 is: 48,977.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,008.40 : 128,939.04 = 32,670.56 : x
  2. Step 2: Convert to fraction form
    86,008.40/128,939.04 = 32,670.56/x
  3. Step 3: Cross multiply
    86,008.40x = 128,939.04 × 32,670.56
  4. Step 4: Simplify right side
    86,008.40x = 4,212,510,642.66
  5. Step 5: Solve for x
    x = 4,212,510,642.66/86,008.40
  6. Step 6: Final answer
    x = 48,977.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.